杰克逊Json到POJO映射

Question

杰克逊第一次入门，我有问题与Java类映射JSON数据。该JSON结构如下：

{ 
    "status": "ok", 
    "all_tags": [ 
    { 
     "id": 14, 
     "term_name": "Term 1", 
     "category_details": [ 
     { 
      "category_ID": 21, 
      "category_name": "Category Name", 
      "category_count": 1, 
      "category_image": "...202x300.jpg" 
     }, 
     { 
      "category_ID": 19, 
      "category_name": "Category Sample", 
      "category_count": 3, 
      "category_image": "...202x300.jpg" 
     } 
     ] 
    }, 
    { 
     "id": 17, 
     "term_name": "Term 2", 
     "category_details": [ 
     { 
      "category_ID": 20, 
      "category_name": "Category Sample Again", 
      "category_count": 1, 
      "category_image": "....200x300.jpg" 
     } 
     ] 
    }, 
    ....... 
    ] 
} 

我以前Jsonschema2pojo网站产生CategoryDetail.java，AllTag.java，Response.java POJO类。

因为我访问JSON在线我用凌空提出要求：

 mRequestQueue = JacksonNetwork.newRequestQueue(getApplicationContext()); 
     mRequestQueue.add(new JacksonRequest<AllTag>(Request.Method.GET, 
     "http://example.com/file.json", 
     new JacksonRequestListener<AllTag>() { 
      @Override 
      public void onResponse(AllTag response, int statusCode, VolleyError error) { 
       if (response != null) { 
        // I am not sure how to parse the JSON 
        // and map the data to POJO 
       } else { 
        Log.e(TAG, "An error occurred while parsing the data! Stack trace follows:"); 
        error.printStackTrace(); 
       } 
      } 

      @Override 
      public JavaType getReturnType() { 
       return SimpleType.construct(AllTag.class); 
      } 
     }) 
); 

我读了documentation，但我不知道如何将JSON数据映射到类，所以我可以循环和retreive数据后来。真的很感谢杰克逊知识的人带我走向正确的方向。

Answer 1

您需要杰克逊阅读snakecase，也多了一个类效应初探

public class Response { 
    String status; 
    List<AllTags> allTags; 
    //setter getter 
    // constructor 
} 

更新请求

 mRequestQueue = JacksonNetwork.newRequestQueue(getApplicationContext()); 
    mRequestQueue.add(new JacksonRequest<Response>(Request.Method.GET, 
    "http://example.com/file.json", 
    new JacksonRequestListener<Response>() { 
     @Override 
     public void onResponse(Response response, int statusCode, VolleyError error) { 
      if (response != null) { 
       // response.getAllTags() loop here 
       // I am not sure how to parse the JSON 
       // and map the data to POJO 
      } else { 
       Log.e(TAG, "An error occurred while parsing the data! Stack trace follows:"); 
       error.printStackTrace(); 
      } 
     } 

     @Override 
     public JavaType getReturnType() { 
      return SimpleType.construct(Response.class); 
     } 
    }) 
);